“大大提前”可以翻译为“significantly advance” 或者 “be greatly brought forward” 。
“significantly advance”强调在时间、进度等方面实现了较大程度的提前，比如：The completion date of the project has been significantly advanced.（项目的完工日期已大大提前。 ）
“be greatly brought forward” 同样表达提前的程度较大，“bring forward”本身就有“提前；提出”的意思，加上“greatly”加强了提前的幅度。例如：The launch time of the new product has been greatly brought forward.（新产品的发布时间已大大提前。 ）